When we first got our hot tub, we had a big problem with foam and scum. I think it was from heavy use in general, but also from the kids wearing big board shorts with residual soap. My wife and I only wear suits when the kids are in the tub with us, but even then she'll wear a thong bikini and I wear an aussieBum bikini. These suits retain little to no residue.
Early in our hot tub-owning days, I was making every effort to add bromine, scale and stain preventer, pH Down, Foam Away, Scum Out, Scum Balls, etc. I was chasing pH levels back and forth all the time and adding some new chemical every other day. These days, I've found that I've hit the sweet spot by adding pH down to bring the water into balance after I fill it, and then I just rotate a newly rinsed and bleached filter once a week with a Spa Frog in the filter compartment. The ozonator keeps the tub free of bacteria, so only once in a while I'll add lithium. For the most part, it's been very minimal maintenance since I started the filter rotation. My biggest issue these days is more scale and calcium deposits on the surfaces of the spa. I'm considering trying a spa water pre-filter the next time I drain and refill.
Regardless, when the kids aren't in the tub with us, we and our friends are naked. Nude soaks are relaxing, fun, convenient, and natural. The great majority of our friends think nothing of stripping down with us right away. As SmilinBare mentions above, the few shy friends we have tend to ditch their suits eventually since we don't change our habits for them! We do have close neighbors, and the tub is in our three-seasons room (all glass), but a modicum of modesty while entering and exiting the tub has resulted in avoiding any neighborhood issues.